the mod has 2 obvious issues. mods from contentdb should be able to be downloaded and work, needing no file rearranging, etc. this mod does not follow that as the mod is contained within the root folder. there a two ways to fix this, make your mod be the root folder, or add a modpack.conf file in the root folder.
the second is that this mod registers ~6914(loc for table) nodes which is ~21.1% (6914/32768) of avaiable nodes in minetest. this is especially wasteful given minetest has hardware coloring https://github.com/minetest/minetest/blob/stable-5/doc/lua_api.txt#L623 which allows you to use param2 to index through a palette allowing 256 varients to be in one node. assuming a complete palette per node, that is 28 nodes (6914/256)